You can turn a Roku TV into what they call Guest Mode and guests can mark their checkout date on the device https://support.roku.com/article/360015611254

If they don't need an "official" floor plan, there is a free app where you walk around the room with your mobile device pointed at where the floor and wall meets.

The problem with that system is that the meters were in each unit and electronically transmitted the usage to a third-party provider for billing.

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The only thing I can add is that she signed the lease on my behalf- the realtor was trying to send me a document for electronic signature, but I couldn’t open it at work, so the realtor sent the document to this person and she put my signature on.

I use Turbotenant for collecting rent and electronic lease signing and it's been great.

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

The advertisement of the property costs a few dollars but you can use the platform the run credit reports and get applications as well as upload your lease and sign electronically etc.  

I do all tenant relations and use Adobe sign for all documents. 80% of my tenants pay electronically and no one has been late.

Now that I have a few quality close-up pictures, I will contact them again electronically.